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This reverts commit 0dbcea96.

Reason for revert: Looking at additional histograms this feature
currently regressions response body read times due to extra thread
hops.  We should wait to launch until we can remove those thread
hops.

Original change's description:
> CacheStorage: Enable the sequence feature by default.
> 
> Bug: 960012
> Change-Id: Ia1c56eedf82376542b2d143692e133a173bd0653
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845856
> Reviewed-by: Matt Falkenhagen <falken@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Commit-Queue: Ben Kelly <wanderview@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#703738}

TBR=falken@chromium.org,rkaplow@chromium.org,wanderview@chromium.org

Change-Id: I0d3fb9c1ed8eea2e07b18082d5f8e92482d9b89c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 960012
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849214Reviewed-by: Ben Kelly <wanderview@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704160}